<script>
  var obj = 123;
  console.log(obj.toString());    // 输出结果：123
  obj = [1, 2, 3];
  console.log(obj.toString());    // 输出结果：1,2,3
  obj = function() {};
  console.log(obj.toString());    // 输出结果：function () {}
</script>
<p>
  <a href="file:///C:/Users/rise/Desktop/%E9%A6%96%E9%A1%B5/default/05.html">返回</a>
</p>